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A voltage clamping circuit and buck converter

A voltage clamping and circuit technology, applied in the direction of output power conversion devices, instruments, electrical components, etc., can solve problems such as complex circuit structures, achieve the effects of simplifying circuit difficulty, saving chip area, and solving complex circuit structures

Active Publication Date: 2019-11-22
SHANGHAI AWINIC TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Based on the deficiencies of the above-mentioned prior art, the present invention proposes a voltage clamping circuit and a step-down converter to solve the problem that the circuit structure is relatively complicated in the existing solution

Method used

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  • A voltage clamping circuit and buck converter
  • A voltage clamping circuit and buck converter
  • A voltage clamping circuit and buck converter

Examples

Experimental program
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Embodiment approach

[0064] See figure 2 , in another specific embodiment of the present application, an implementation manner of the signal generating unit 103 includes: a first capacitor C1.

[0065] Wherein, the first terminal of the first capacitor C1 receives the reference current, and the second terminal is grounded. The first end of the first capacitor C1 receiving the reference current is used as the output end of the signal generating unit.

[0066] In practical application, the voltage change in the reference current can be seen from image 3 , is the voltage gradually increasing from 0 to the working voltage VDD, that is, the incremental signal generated by the signal generating unit 103 .

[0067] Of course, the magnitude and change mode of the voltage of the reference current can also be set according to the application environment and user needs, which are not specifically limited in this application, and all belong to the protection scope of this application.

[0068] see also ...

specific Embodiment approach

[0113] Optionally, see also Figure 5 , in a specific embodiment of the present application, a specific implementation manner of the filtering unit 406 includes:

[0114] The first inductor L and the third capacitor C3.

[0115] A first end of the first inductor L is connected to the drain of the PMOS transistor, and a second end of the third capacitor C3 is grounded. Wherein, the common terminal of the first inductor L and the third capacitor C3 is used as the output terminal of the filter unit 406 to output the output voltage.

[0116] It should be noted that the third voltage can be filtered through the first inductor L and the third capacitor C3, which can reduce the ripple of the output voltage output by the step-down converter.

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Abstract

The invention provides a voltage clamping circuit and a buck converter. The voltage clamping circuit comprises a timer, a control unit and a signal generation unit; the timer is connected with the control unit; the signal generation unit is used for generating a gradually increasing signal; the control unit is used for receiving the first voltage inputted into the control unit, controlling the input end of the control unit to be connected with the output end of the signal generation unit when the timing moment of the timer does not reach the preset moment, receiving the gradually-increased signal generated by the signal generation unit and controlling the first voltage to change along with the gradually-increased signal; and / or, when the timing moment of the timer reaches the preset moment, the control unit controls the input end of the control unit to receive a fixed voltage, and if the first voltage is greater than the fixed voltage, the control unit controls the first voltage to perform voltage drop. The control unit, the timer and the signal generation unit are integrated in the same circuit, so that the circuit difficulty is simplified.

Description

technical field [0001] The invention relates to the field of electronic circuits, in particular to a voltage clamping circuit and a step-down converter. Background technique [0002] Buck converters are widely used in various electronic products because they can convert an input high DC voltage into a stable low DC voltage output. In a buck converter, an error amplifier, a soft-start circuit, and a voltage clamping circuit are usually provided. The error amplifier is used to increase the loop gain, and the soft-start circuit is used to control the inductor current after the buck converter starts to start. Or the voltage reaches a default value in a gradual manner, and the voltage clamping circuit is used to clamp the output voltage of the error amplifier to a certain voltage value. [0003] In the prior art, both the soft start circuit and the voltage clamping circuit are independent circuit structures, the soft start circuit is usually set at the input end of the error amp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/155
CPCH02M3/155
Inventor 严之嶽李念龙程剑涛杜黎明孙洪军乔永庆
Owner SHANGHAI AWINIC TECH CO LTD
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